Tzatziki, Tzadziki, or Tsatsiki (τζατζίκι) is a Greek meze, or appetizer derived from the Turkish cacık, also used as a sauce or dip. The Greek word is derived from the Turkish cacık, which means a form of chutney (Cacik, the Turkish side dish with similar ingredients, is more diluted). Tzatziki is made of strained yoghurt (which in Greece and Turkey is usually made of sheep or goat milk), cucumbers (either pureed and strained or seeded and finely diced), sometimes onion, and garlic for taste—in Greece this can be as much as a whole head of garlic for a large bowlful of tzatziki.